(c) Obtain and interpret a 90% twosided condence interval for the population mean age of all U.S. miilionaires. (6 marks) (d) Does the interval in part (:1 give evidence that the average age of all U.S. millionaires differs from 60 years? Explain your answer. {3 marks) (e) Determine the number of millionaires who should be picked to guarantee that the error made in estimating ,u by k is at most 0.5 years with 98% condence. (4 marks) 6. Past studies showed that maternal diabetes results in obesity, blood pressure. and glucose tolerance complications in offspring. Following are the arterial blood pressures, in millimetres of mercury (mm Hg}, for a random sample of 16 children of diabetic mothers. The sample mean is 5: = 85.99 mm Hg and the sample standard deviation is s = 8.08 mm Hg. 81.6 84.1 87.6 82.8 82.0 88.9 86.7 96.4 84.6 101.9 90.8 94.0 69.4 78.9 75.2 91.0